Temperature Tower Retraction Setting Missing Prime (Unretract) Speed

[MooMinIL]

When iterating back and forth between Temp and Retract tower testing I noticed there wasn't an option to edit the Prime (Unretract) Speed for the temp tower. While this setting isn't SUPER critical for calibration - I found that in some filaments I had to adjust it slightly for better surface finish when retracting, so adding it to the temp tower would make the back and forth iterations between temp and retract more complete for those cases.